Well, im hoping it was dust.  Whole camper is covered in it.  Needs the exterrior cleaned again actually.  I went after it with a hose, bucket of suds and a brush.  Basically knocked off the first layer.
Proceeded to dewinterize, and start on the inside.  Most of it had simply setteled, and cleaned it up with a dry cloth.
Pretty clean now, but has a bad dryer sheet smell that i cant stand.  Likely get it to the park tomorrow, and finish the dirty work in a camping process this weekend.
Just went outside to pull my slides in, in the dark and under my exterrior house lights  it looks awesome, shiny.  A beer, dimmed lights, the radio, and a final interior cleanng inventory is a good time.